Rspamd is an advanced spam filtering system that allows evaluation of messages by a number of rules including regular expressions, statistical analysis and custom services such as URL black lists.

Over 8 million people use MailWasher as their spam filter

Introducing MailWasher, the leader in spam filter software, and the easiest way to check and manage your e-mails before you download them.

MailWasher is free to use and wont ever expire. It works with Outlook, Outlook Ex.

Proxmox Mail Gateway is the leading open-source email security solution helping you to protect your mail server against all email threats the moment they emerge.

MailScanner is a open source email security system design for Linux-based email gateways. It is used at over 30,000 sites around the world, protecting top government departments, commercial corporations and educational institutions.

AntispamSniper for The Bat! is a powerful antispam and anti-phishing plugin, providing advanced email protection and filtering for The Bat! email client.

Bogofilter is a mail filter that classifies mail as spam or ham (non-spam) by a statistical analysis of the message's header and content (body). The program is able to learn from the user's classifications and corrections.

BoxTrapper is a tool that filters spam from your inbox through a process called challenge-response verification. When an account that has BoxTrapper enabled receives an email, it automatically sends a customizable verification email in response.

Save time by adding powerful spam filtering to the e-mail client on your Mac. One of the only standalone spam filtering softwares for Mac.

Scrollout F1 is a free self-hosted email gateway designed for Linux & Windows administrators without advanced email security experience.

Anti-spam gateway blocks more than 99% of spam with less than one in 1 million false positives and real-time automatic updates.

Most people find spam e-mails the biggest nuisance on the Internet. Today, spam e-mails account for over 80% of all e-mail traffic and their volumes increase daily. Strike back with BullGuard Spamfilter.

Spam Reader is a free anti-spam add-on for Microsoft Outlook. The software uses the most reliable approach to block junk emails - Bayesian algorithm based on statistical analysis, capable to be adjusted to user's needs and detect up to 98% of spam messages.